Feedeeick pletchee byisgton



(Model.)

P. P. BYINGTON.

GAGE ATTACHMENT PGB. PRINTING PRESSES. No. 351,309. Patented Oct. 19, 1886.

WITNESSES I INVBNTOR i l BY ATTORNEYS.

UNITED STATES PATENT OFFICE.

FREDERICK FLETCHER BYINGTON, OF OAKLAND, CALIFORNIA.

GAGE ATTACHMENT FOR PRINTINGHPRESSES.

SPECIFICATION forming part 0f Letters Patent N0. 351,309, dated 001201081 19, 1886. Application tiled November 4, 1585. Serial No. 181,859. (Model.)

To a/ZZ whom it may concern.'

Be it known that l, FREDERICK FLETCHER BYINGTON, of Oakland, in the county of Alameda and State of California, have 'invented a new and useful Improvement in Gage Attachinents for Printing-Presses, of which the following isa description.

Figure lis a perspective view showing the application of my invention to the platen of a printing-press. Fig. 2 is alongitudinal section through line :v :c of Fig. l, drawn on a larger scale, and Fig. 3 is a detail of the channel-plate.

My invention is in the nature of a gage attachment for the platens of job printingpresses for fixing the position ot' the cards or blank sheets, so as to cause them to properly register in receiving the impression from the type` I In 4the drawings, A represents the platen of a press, which is provided, as usual, with the bail'shaped clamp-bars B B, that are pivoted to the side edges of the platen, and areswung down over the edges to clamp and hold the sheets of paper that are placed upon the platen.

C is a curved spring, which at one end is turned at nearly .right angles at a., and pro-l vided with two sharp points to engage with the tympan-sheets. Through a slot in this flanged or turned edge there projects a tongue, b, connected to the end of the spring by clips that embrace the same, said tongue being used to retain the sheets of paper and cards and prevent their slipping over the gage. The curved spring C slides adjustably through a slot or channel in a plate, D, which plate is bent to such curvature as to hold the spring in this channel to any desired adjustment. To the under side of this plate, and closing the channel or slot, is riveted a plate, c, having a blade, d, projecting therefrom nearly at right angles. rlhis blade serves to connect the spring-plate and spring to the platen by being caught and held by frictional contact between the outer edge ot' the platen vA and the inner edge of one of the bail-shaped clamp bars B. To insure thc tight holding of this blade against any tendency to drop -out by the 5o jar of the press, the blade is slightly curved,

so that it has a degree of elasticity, like a spring, which holds itin place when clamped.

When the spring-holding plate is thus secured, the spring,who'se normal shape is curved, lies flat against the tympan-sheets,with the points in the tympanesheets just where the edge of the card or blank sheet s is designed to come. To adjust these points to ahigher orlower position the spring C is simply slipped through the channel in the springplate, and as the gage is adjusted close to the edge of the tyinpan, where the spring is secured, the spring, by reason of its curvature, turns at its free or back end under the platen, and out of the way. I/Vhere said spring lies on the tympan-sheet, however, it'lies perfectly flat against the same, this result being obtained by making the spring tapered or smaller at the end which forms the gage. A curved spring ot' uniform transverse dimension will not lie dat against a plain surface, for the reason that there is a cumulative tension from both ends toward the center that makes it buckle up at the center. Thetapered construction of my spring causes the tension to decrease constantly from the point of connection at the holder toward the small end, and as the greater strength of tension overcomes the less each point on the spring is held ilat by t-he superior tension of the part nearer the holder.

Among the advantages of my invention I may mention that there are no prongs to stick through the tympan-sheet and card-board beneath, which spoils the tympan-sheets and injures the surl'ace of the card-board. .Vith this invention the cardboards are kept perfectly smooth. Again, it is very easily adjusted in place, for while the blade is being put between the clamp and platen 'the spring may be drawn out and the gage placed eX- actly where the sheet is to be held; also, when the gage is to be changed, it can be changed to any extent, and instantly.

Having thus described my invention, what I claim as new is- The curved spring-bars C, made tapering, as shown and described, in combination with a holder, D, as and for 'the purpose described.

FREDK. FLETCHER BYINGTON.

Vtnesses:

C. XV. CARRU'rn, E. A. CHAPMAN. 

